Welding silver contact product series and process parameters
1. Welding Silver contact types
(1). Square Silver Contact: dimensional accuracy ±0.02mm, thickness 0.3-5mm, suitable for high current circuit breakers.
(2). Disc Silver Contact: diameter 1-20mm, surface roughness Ra≤0.2μm, used for micro relays.
(3). Silver Tin Oxide Soldering Silver Contacts: They offer good wear-resistant performance with a hardness ranging from approximately 80 to 120HV.
(4). Convex Silver Contact: convex point height 0.1-0.5mm, adjustable contact pressure, improves arc extinguishing efficiency.
2. Welding process and technical parameters
| Welding process | Applicable scenarios | Process parameters | Advantages |
| Soldering of silver contacts | Low-temperature soldering (＜250℃) | Tin-lead solder (Sn60Pb40), flux activity ≤0.1% | Low cost, suitable for small relay contacts |
| Silver contact silver brazing | High temperature and high strength connection (＞600℃) | BAg72Cu solder, fluidity ≥80mm/10s | Tensile strength ≥200MPa, high temperature oxidation resistance |
| Silver contact resistance welding | High-speed automated production | Current 5-10kA, pressure 0.5-1.5MPa, time 10-50ms | Welding efficiency ＞500pcs/min, zero porosity |
| High-frequency welding of silver contacts | Precision components (such as new energy contractors) | Frequency 200-400kHz, heating rate 100℃/s | Heat affected zone <0.1mm, avoid material lattice distortion |
Typical application components:
(1). Silver contact and copper terminal welding components: silver brazing + nickel plating process, contact resistance <0.8mΩ, passed 1000 thermal cycle tests.
(2). Silver contact and brass terminal welding components: high-frequency welding + ultrasonic cleaning, ensure that the bonding strength between brass (H62) and silver layer is ≥15N/mm².
3. Material properties and industry applications
(1). Performance comparison of AgCdO(12) vs. AgSnO2(12)
| Characteristics | AgCdO(12) | AgSnO2(12) |
| Electrical conductivity | 45MS/m | 42MS/m |
| Arc resistance | Excellent (suitable for 10-100A current) | Excellent (suitable for impulse current above 100A) |
| Environmental protection | Contains Cd (special treatment required) | Cadmium-free, RoHS-compliant |
(2). Solutions for key industries
New energy high-voltage DC contactor: AgSnO2(12) welded silver contacts. The arc resistance of the components supports 1000VDC/200A working conditions.
Intelligent circuit breaker: Internal oxidation AgCdO(12) contacts + resistance welding copper terminals, breaking capacity up to 10kA.
Industrial relay: 0.5mm thick disc contacts + high-frequency welding, life expectancy exceeds 500,000 times.
4. Quality Control and Customer Value
Testing Standard: Execute ISO 8841 (silver contact material) and IEC 61810-1 (relay test).
Key Indicators:
(1). Welding Strength: Shear Force ≥50N (Soldering), ≥120N (Silver Brazing).
(2). Porosity: X-ray detection <0.5%.
Technical Advantages
With our independently developed internal oxidation silver alloy process (AgCdO(12) and AgSnO2(12)), we have broken the performance limitations of traditional powder metallurgy and provided high-reliability solutions for mid-to-high-end markets such as relays, circuit breakers, and new energy high-voltage DC contactors.
1. Core Competitive Advantages
(1). Material Innovation:
Internal oxidation silver alloy: Through a high-temperature oxidation process, the silver matrix and CdO/SnO2 are uniformly composited at the nanoscale; the crystal density is increased by 30%, the conductivity is ≥42MS/m, and the hardness HV reaches 80-100, which is significantly better than powder metallurgy products.
Arc erosion resistance: AgSnO2(12) has a 50% reduction in arc burnout rate and stable contact resistance of less than 0.5mΩ in high current scenarios above 20A.
(2). Full industry chain coverage:
From silver alloy smelting and internal oxidation treatment to welding silver contacts and stamping (square/round/convex types), as well as integrating silver contact welding assemblies (using red copper/brass terminals), one-stop production is achieved.
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